Protecting-jacket for valve-stems.



R. A. MIDGLEY.

PROTECTING JACKET FOR VALVE STEMS.-

APPLICATION FILED MAR. 1. 1916.

' 1,137,362, PatentedJune 13, 1916.

aw v Meanwh- RAY ARTHUR MIDGLEY, OF GADSDEN, ALABAMA.

PROTECTING-JACKET FOR VALVE-STEMS.

' Specification of Letters Patent.

Patented June is, rare.

Application filed March 1,1916. Serial No. 81,467.

To all whom it may concern:

Be it known that I RAY A. MIDGLEY, a citizen of the United States,residing at Gadsden, in the county of Etowah, State of Alabama, haveinvented a new and useful Protecting Jacket or Sleeve for Valve- Stems;and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same. I

This invention relates to the art of valves, particularly to the puppetkind, and more especially to a protecting jacket or sleeve for the valvestem thereof, to prevent the carbon from burning on to the valve stem,

and to protect the same from the heat and grease, thereby avoiding'valvetrouble.

Another object of the invention is the provision of a guide for thevalve stem, and

over the end of which guide the protecting sleeve or jacket telescopesin spaced relation thereto when the valve is closed.

It has been found that, even though the provision of a sleeve orprotecting jacket has been made heretofore, a thin coating of carbon,more or less tends to adhere to the upper end of the guide, over whichthe sleeve or jacket telescopes in spaced relation, therefore it is theaim of this invention to provide means to extricate or remove thiscoating (which also adheres to the upper extremity of the guide), hencethe provision of means on the inner circumference of the sleeve orjacket, to scrape or out against such carbon, to fracture and dislodgethe same.

In practical fields the details of construction may necessitatealterations, falling within the scope of what is claimed.

The invention comprises further features and combination of parts, ashereinafter set forth, shown in the drawings and claimed.

In the drawings: Figure 1 is a sectionalview through a portion of aninternal combustion engine, showing one of its exhaust puppet valves.Fig. 2 is a cross sectional view on line 22 of Fig. 1. Fig. 3 is a viewin section showing means on the interior of the sleeve or jacket forfracturing and dislodging the coating of the carbon on the guide. Fig.4. is a sectional View on line .14: ofFig. 3. Fig. 5 is a sectionalpersptlective view of the sleeve or jacket and th va ve. i

Referring more especially to the drawmgs, 1 deslgnates the cylinder ofan internal combustion engine surrounded by a water acket 2. Leadingfrom the cylinder -1 is an exhaust port or chamber 3 having formedtherein a valve seat 4. Mounted on the seat. 4 and normally closing theexhaust P pe port 3 is an exhaust valve 5 of the type, havingits-depending stem working in a guide or hearing 7 the upper end ofwhich is tapered as shown. The greater portion of the guide, andparticularly its tapered part projects into the exhaust port 3. Formedintegral with the puppet valve and the upper part of its stem thereofisa downwardly extending tapering 'sleeve 9,

which telescopes down upon the tapered part of the guide. Where thetapered part of the guide merges into the body thereof,

a curved shoulder 10 is formed. The lower extremity of the sleeve orjacket of the valve terminates in an outwardly and downwhen the valve isclosed is at a spaced interval above said shoulder 10. Where the sleeveor jacket connects or merges into the under face of the valve, acontracted neck 13 is formed, which curves into the under face of thevalve as shown at 1 1. The interior circumference of the sleeve orjacket is of a taper substantially corresponding to the taper of theupper portion of the guide,

'wardly flared portion or flange 12, which, I

and is slightly spaced therefrom. However,

the upper wall or end of the interior of the sleeve or jacket engagesthe upper end of the tapered part of the guide, thereby preventing thecarbon and the like from reaching the valve stem. The lower part of thevalve stem is provided with a shoulder 16,

jacket lowers with the valve, the ribs will tend to fracture anddislodge the carbon. The upper end or wall of the interior of the sleeveor jacket is provided with an annular rib 19, when the valve closes orenan exhaust valve of the puppet type, having a stem, of an elongatedguide having a tapered upper extremity projecting from the lower part ofthe exhaust port, and in which the stem is guided, a protecting jacketor sleeve extending from the under face of the valve where the stemconnects thereto and being tapered in conformity with the upper taperedpart of the guide, to telescope thereover in slightly spaced relationwith the tapered part of the guide, the interior circumference of thejacket and its upper end wall having means to contact with and fracturethe carbon.

In testimony whereof I have signed my 'name to this specification invthe presence of two subscribing witnesses.

RAY ARTHUR MIDGLEY'.

Witnesses:

GEO. A. GLENN, ED MORIARTY.

